You can use your Twilio number as a fully-capable proxy number with only your personal phone, allowing you to make and receive outgoing and incoming calls without the need for an application or server. To achieve this, you build a Studio Flow that checks the calling number and forwards calls accordingly. The flow allows users to input the desired number to call when their personal number is detected, while forwarding other calls to their personal phone. Once configured, your Twilio number can be used to place outgoing calls and receive incoming calls with only your personal phone.